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# Periodic Classification of Elements

Need for classification, Modern periodic table, gradation in properties, valency, atomic number, metallic and non-metallic properties.

### Modern Periodic Table

Modern Periodic Law: Given by Henry Moosley in 1913. Properties of elements are a periodic function of their atomic number. Atomic Number: denoted by Z...

### Periodic Classification of Elements

Substances containing atoms of only one type. e.g Na, Au, Mg etc. There are around 118 elements known to us. The first classification of...